Global wealth is increasingly concentrated in the hands of a small wealthy elite. These wealthy individuals have generated and sustained their vast riches through their interests and activities in a few important economic sectors, including finance and insurance and pharmaceuticals and healthcare. Companies from these sectors spend millions of dollars every year on lobbying to create a policy environment that protects and enhances their interests further. The most prolific lobbying activities in the US are on budget and tax issues; public resources that should be directed to benefit the whole population, rather than reflect the interests of powerful lobbyists. This briefing explains Oxfam’s methodology and data sources and updates key inequality statistics, such as Oxfam’s frequently cited fact in 2014: ‘85 billionaires have the same wealth as the bottom half of the world’s population. Free downloadable via: http://www.oxfam.org/sites/www.oxfam.org/files/file_attachments/ib-wealth-having-all-wanting-more-190115-en.pdf. The additional calculations that led to this report can be downloaded at: http://www.oxfam.org/sites/www.oxfam.org/files/file_attachments/ib-data-wealth-having-all-wanting-more-190115-en.xlsx.